Abstract
Utilization of carbon dioxide (CO2) as a feedstock of valuable chemicals is necessary to achieve carbon neutrality. CO2 electrolysis producing valuable organic molecules such as carbon monoxide (CO) is one of the most promising methods. To implement this technology in society, a large-sized electrolyzer that can convert a huge amount of CO2 are required. Toshiba is developing a low-temperature zero-gap type CO2 electrolysis cell/stacks with 400 cm2 electrodes to produce CO [1,2], which can be converted into chemicals and fuels by catalytic reactions with hydrogen. With properly designed gas flow plates and optimal operation conditions, CO faradaic efficiency of the 400cm2 single cell were comparable to that of a smaller cell with 4 cm2 electrode [3]. Another problem to be solved is low durability of the electrolyzer. During continuous operation of the electrolyzer, several failure modes such as cathode flooding, salt precipitation, diaphragm degradation, corrosion of flow plates, and catalyst dissolution often occur. By resolving each of these failure modes, stable performance over 500 h was achieved. Additionally, in this presentation, we report the results of electrolysis tests using CO2 gas containing impurities that are expected to be contaminated in an actual environment, and the results of electrolysis tests to confirm effects of a ripple current generated from AC/DC converter on the efficiency of CO2 electrolyzer. Part of this work is commissioned by Ministry of the Environment, Government of Japan. [1] Y. Kofuji, A. Ono, Y. Sugano, A. Motoshige, Y. Kudo, M. Yamagiwa, J. Tamura, S. Mikoshiba, and R. Kitagawa, Chem. Lett., 50, 482-484 (2021). [2] Y. Kiyota, Y. Kofuji, A. Ono, S. Mikoshiba, and R. Kitagawa, 242nd ECS Meeting, I05, 1942, (2022). [3] Naoya Fujiwara, Yusuke Kofuji, Satoshi Mikoshiba, Ryota Kitagawa, Atsushi Matsunaga, Isamu Kikuchi, Soichiro Shimotori, 244th ECS Meeting, I05, 2328, (2023).
Published Version
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